CVE-2013-0228 xen: xen_iret() invalid %ds local DoS (rhbz 910848 906309)

This commit is contained in:
Josh Boyer 2013-02-14 09:22:51 -05:00
parent 1d8418f89e
commit f052f6baae
2 changed files with 141 additions and 1 deletions

View File

@ -62,7 +62,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 1
%global baserelease 2
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -745,6 +745,9 @@ Patch21247: ath9k_rx_dma_stop_check.patch
#rhbz 910126
Patch21249: pstore-Create-a-convenient-mount-point-for-pstore.patch
#rhbz 906309 910848 CVE-2013-0228
Patch21260: xen-dont-assume-ds-is-usable-in-xen_iret-for-32-bit-PVOPS.patch
Patch22000: weird-root-dentry-name-debug.patch
#selinux ptrace child permissions
@ -1455,6 +1458,9 @@ ApplyPatch ath9k_rx_dma_stop_check.patch
#rhbz 910126
ApplyPatch pstore-Create-a-convenient-mount-point-for-pstore.patch
#rhbz 906309 910848 CVE-2013-0228
ApplyPatch xen-dont-assume-ds-is-usable-in-xen_iret-for-32-bit-PVOPS.patch
# END OF PATCH APPLICATIONS
%endif
@ -2310,6 +2316,9 @@ fi
# ||----w |
# || ||
%changelog
* Thu Feb 14 2013 Josh Boyer <jwboyer@redhat.com>
- CVE-2013-0228 xen: xen_iret() invalid %ds local DoS (rhbz 910848 906309)
* Wed Feb 13 2013 Peter Robinson <pbrobinson@fedoraproject.org>
- Disable tegra30

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@ -0,0 +1,131 @@
From 13d2b4d11d69a92574a55bfd985cfb0ca77aebdc Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@suse.com>
Date: Thu, 24 Jan 2013 13:11:10 +0000
Subject: [PATCH] x86/xen: don't assume %ds is usable in xen_iret for 32-bit
PVOPS.
This fixes CVE-2013-0228 / XSA-42
Drew Jones while working on CVE-2013-0190 found that that unprivileged guest user
in 32bit PV guest can use to crash the > guest with the panic like this:
-------------
general protection fault: 0000 [#1] SMP
last sysfs file: /sys/devices/vbd-51712/block/xvda/dev
Modules linked in: sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4
iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6
xt_state nf_conntrack ip6table_filter ip6_tables ipv6 xen_netfront ext4
mbcache jbd2 xen_blkfront dm_mirror dm_region_hash dm_log dm_mod [last
unloaded: scsi_wait_scan]
Pid: 1250, comm: r Not tainted 2.6.32-356.el6.i686 #1
EIP: 0061:[<c0407462>] EFLAGS: 00010086 CPU: 0
EIP is at xen_iret+0x12/0x2b
EAX: eb8d0000 EBX: 00000001 ECX: 08049860 EDX: 00000010
ESI: 00000000 EDI: 003d0f00 EBP: b77f8388 ESP: eb8d1fe0
DS: 0000 ES: 007b FS: 0000 GS: 00e0 SS: 0069
Process r (pid: 1250, ti=eb8d0000 task=c2953550 task.ti=eb8d0000)
Stack:
00000000 0027f416 00000073 00000206 b77f8364 0000007b 00000000 00000000
Call Trace:
Code: c3 8b 44 24 18 81 4c 24 38 00 02 00 00 8d 64 24 30 e9 03 00 00 00
8d 76 00 f7 44 24 08 00 00 02 80 75 33 50 b8 00 e0 ff ff 21 e0 <8b> 40
10 8b 04 85 a0 f6 ab c0 8b 80 0c b0 b3 c0 f6 44 24 0d 02
EIP: [<c0407462>] xen_iret+0x12/0x2b SS:ESP 0069:eb8d1fe0
general protection fault: 0000 [#2]
---[ end trace ab0d29a492dcd330 ]---
Kernel panic - not syncing: Fatal exception
Pid: 1250, comm: r Tainted: G D ---------------
2.6.32-356.el6.i686 #1
Call Trace:
[<c08476df>] ? panic+0x6e/0x122
[<c084b63c>] ? oops_end+0xbc/0xd0
[<c084b260>] ? do_general_protection+0x0/0x210
[<c084a9b7>] ? error_code+0x73/
-------------
Petr says: "
I've analysed the bug and I think that xen_iret() cannot cope with
mangled DS, in this case zeroed out (null selector/descriptor) by either
xen_failsafe_callback() or RESTORE_REGS because the corresponding LDT
entry was invalidated by the reproducer. "
Jan took a look at the preliminary patch and came up a fix that solves
this problem:
"This code gets called after all registers other than those handled by
IRET got already restored, hence a null selector in %ds or a non-null
one that got loaded from a code or read-only data descriptor would
cause a kernel mode fault (with the potential of crashing the kernel
as a whole, if panic_on_oops is set)."
The way to fix this is to realize that the we can only relay on the
registers that IRET restores. The two that are guaranteed are the
%cs and %ss as they are always fixed GDT selectors. Also they are
inaccessible from user mode - so they cannot be altered. This is
the approach taken in this patch.
Another alternative option suggested by Jan would be to relay on
the subtle realization that using the %ebp or %esp relative references uses
the %ss segment. In which case we could switch from using %eax to %ebp and
would not need the %ss over-rides. That would also require one extra
instruction to compensate for the one place where the register is used
as scaled index. However Andrew pointed out that is too subtle and if
further work was to be done in this code-path it could escape folks attention
and lead to accidents.
Reviewed-by: Petr Matousek <pmatouse@redhat.com>
Reported-by: Petr Matousek <pmatouse@redhat.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/xen/xen-asm_32.S | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/xen/xen-asm_32.S b/arch/x86/xen/xen-asm_32.S
index f9643fc..33ca6e4 100644
--- a/arch/x86/xen/xen-asm_32.S
+++ b/arch/x86/xen/xen-asm_32.S
@@ -89,11 +89,11 @@ ENTRY(xen_iret)
*/
#ifdef CONFIG_SMP
GET_THREAD_INFO(%eax)
- movl TI_cpu(%eax), %eax
- movl __per_cpu_offset(,%eax,4), %eax
- mov xen_vcpu(%eax), %eax
+ movl %ss:TI_cpu(%eax), %eax
+ movl %ss:__per_cpu_offset(,%eax,4), %eax
+ mov %ss:xen_vcpu(%eax), %eax
#else
- movl xen_vcpu, %eax
+ movl %ss:xen_vcpu, %eax
#endif
/* check IF state we're restoring */
@@ -106,11 +106,11 @@ ENTRY(xen_iret)
* resuming the code, so we don't have to be worried about
* being preempted to another CPU.
*/
- setz XEN_vcpu_info_mask(%eax)
+ setz %ss:XEN_vcpu_info_mask(%eax)
xen_iret_start_crit:
/* check for unmasked and pending */
- cmpw $0x0001, XEN_vcpu_info_pending(%eax)
+ cmpw $0x0001, %ss:XEN_vcpu_info_pending(%eax)
/*
* If there's something pending, mask events again so we can
@@ -118,7 +118,7 @@ xen_iret_start_crit:
* touch XEN_vcpu_info_mask.
*/
jne 1f
- movb $1, XEN_vcpu_info_mask(%eax)
+ movb $1, %ss:XEN_vcpu_info_mask(%eax)
1: popl %eax
--
1.7.7.6